51613525 has 12 divisors (see below), whose sum is σ = 64637604. Its totient is φ = 40880000.

The previous prime is 51613511. The next prime is 51613537. The reversal of 51613525 is 52531615.

It can be written as a sum of positive squares in 6 ways, for example, as 5726449 + 45887076 = 2393^2 + 6774^2 .

It is not a de Polignac number, because 51613525 - 2¹¹ = 51611477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51613493 and 51613502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7696 + ... + 12745.

It is an arithmetic number, because the mean of its divisors is an integer number (5386467).

Almost surely, 2^51613525 is an apocalyptic number.

It is an amenable number.

51613525 is a deficient number, since it is larger than the sum of its proper divisors (13024079).

51613525 is a wasteful number, since it uses less digits than its factorization.

51613525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20552 (or 20547 counting only the distinct ones).

The product of its digits is 4500, while the sum is 28.

The square root of 51613525 is about 7184.2553545931. The cubic root of 51613525 is about 372.3241215863.

It can be divided in two parts, 516 and 13525, that added together give a palindrome (14041).

The spelling of 51613525 in words is "fifty-one million, six hundred thirteen thousand, five hundred twenty-five".